<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th><input type="checkbox" v-model="status" /> <span>全选</span></th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <Tr
          v-for="(obj, index) in goodList"
          :key="index"
          :obj="obj"
          :sta="status"
          :index="index"
          @isAll="allFn"
          @createFn="adFn"
          @jjFn="reduceFn"
        ></Tr>
      </tbody>
      <tfoot>
        <tr>
          <td>合计:{{ allPrice }}</td>
          <td colspan="5"></td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
import Tr from "./components/Tr.vue";
export default {
  data() {
    return {
      goodList: [
        {
          name: "诸葛亮",
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: "蔡文姬",
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: "妲己",
          price: 2000,
          num: 1,
          checked: false,
        },
        {
          name: "鲁班",
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
    };
  },
  components: {
    Tr,
  },
  computed: {
    status: {
      set(val) {
        return this.goodList.forEach((item) => (item.checked = val));
      },
      get() {
        return this.goodList.every((item) => item.checked === true);
      },
    },
    allPrice() {
      return this.goodList.reduce((sum, item) => {
        if (item.checked === true) sum += item.price * item.num;
        return sum;
      }, 0);
    },
  },
  methods: {
    allFn(ind) {
      this.goodList.splice(ind, 1);
    },
    adFn(num, ind) {
      this.goodList[ind].num = num;
    },
    reduceFn(num, ind) {
      this.goodList[ind].num = num;
    },
  },
  watch: {
    goodList: {
      deep: true,
      handler() {
        localStorage.setItem("list", JSON.stringify(this.goodList));
      },
    },
  },
};
</script>

<style>
</style>